Ralf Rottmann is CTO and co-founder of the largest mobile application developer in Germany, Grandcentrix. He has more Apple devices than an Apple Store and thinks he's a fanboy - yet, he's switched to the Nexus 4 completely, stating that "the latest version of Android outshines the latest version of iOS in almost every single aspect". This line in particular rings true for me as a Windows Phone 8 and Android user: "whenever I grab my iPhone for testing purposes, iOS feels pretty old, outdated and less user friendly". This will most likely be dismissed as a troll by some, but it has to be said: iOS has become stale, bordering on being outdated, and lacks several crucial pieces of functionality, neatly detailed in Rottman's article. Apple has a lot of catching up to do, or it will be Mac OS all over again.

I never grab my iPhone 4S for 'testing purposes.' I always grab it to use it as the fine tool that it is. Since this device works very well (for me) in an ecosystem that is, arguably, superior to any other, there is not yet a reason that I have found to go beyond 'playing with' non-IOS devices...YMMV.